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Dead Reckoning

A reference to an historical navigation method. Starting from a place of certainty by calculating a previously determined position and then advancing that position with the use of instruments and analysis. The process of dead reckoning allows the navigator to know where they are in a featureless ocean. However, sometimes ships are knocked off course by un-foreseen natural events and are lost.

broken

balloon field, one of several iron balloons suspended by an invisible magnetic field.